btrfs: lzo: document the compressed data format
Although it's not that complex, but such comment could still save several minutes for newer reader/reviewer instead of inferring that from the code. Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> [ minor wording updates ] Signed-off-by: David Sterba <dsterba@suse.com>
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